Climate Change Mitigation and Adaptation Actions in the Sierra de San Pedro Mártir

BAJA WORKING GROUP – CLIMATE SCIENCE ALLIANCE

Climate Change Mitigation and Adaptation Actions in the Sierra de San Pedro Mártir Pamela Castro Figueroa (Terra Peninsular) Mariana Elizabeth Espinosa Blas (Terra Peninsular)

Key Takeaways: •

Increasing wildfires emit carbon dioxide (CO2) into the atmosphere and reduce the capacity of forest floors and forest biomass to capture and store CO2, putting the community and the ecosystem services that the Sierra provides at risk.

•

It is important to focus efforts on understanding the effects of fires on soil (specifically, their quality and carbon storage capacity), the spatiotemporal viability of prescribed burns in the areas, their effects on water balances, and their effects on the distribution of flora and fauna in the region.

www.climatesciencealliance.org/2021-baja-report

What is the focus and area of your research?

The Sierra de San Pedro Mártir, located in the central part of Baja California, is part of the Mediterranean bioclimatic corridor and of the extreme southern portion of the California Floristic Province—one of the 35 global biodiversity hotspots. Since 1947, parts of the highest and most forested areas of the Sierra were decreed part of a National Park, a category of Federal Natural Protected Area, for their conservation.

Similarly, the Sierra de San Pedro Mártir is recognized as a Priority Terrestrial Region (No. 10 - CONABIO), Priority Hydrological Region (No.1 - CONABIO), and an Area of Importance for Bird Conservation (No. 104).

This is an area recognized for its pristine ecosystems, such as chaparral, meadow-wetlands, and mixed forests, where diverse species of flora and fauna are housed. It is also an area where diverse ecosystem services are provided, including its hydrological value, which communities such as San Quintín, Lázaro Cárdenas, and Vicente Guerrero rely on.

Despite being considered an area with a high degree of conservation measures, in reality the region faces a variety of threats, including forest fires and overgrazing.

How do you see climate change impacting the focus of your work?

Climate change will impact the focus of our work through the projected scenarios of increasing temperatures and decreasing rainfall events in the region. Changes in these patterns have a direct effect on the frequency and severity of forest fires (1).

The suppression of fire over recent years has helped fuel loads accumulate into large quantities, increasing the risk of fires.

As a climate change adaptation measure, we have worked to contribute to a healthy fire regime, through fire management actions focused on the reduction of accumulated combustibles and on the restoration of firebreak gaps. Similarly, in an attempt to contribute to biomass carbon capture, we worked on reforesting 10 hectares in the Sierra and on activities that support soil conservation.

What do you anticipate being impacts on your focus area?

According to climate change projections, it is estimated that, in the region, there will be changes in precipitation and temperature patterns (1).

The decrease in precipitation events and the increase in temperature means more prolonged dry seasons and, as a consequence, a heightened risk of more frequent and severe forest fires in the region. That, in turn, modifies natural fire regimes and the resilience capacity of the ecosystems (2).

Moreover, another projected effect of climate change for the Sierra is the decrease in the abundance and distribution of coniferous species (3). In addition to placing the region at a high level of vulnerability to the impacts of climate change, this also endangers the ecosystem services that the Sierra provides to communities—such as those associated with hydrological aspects and refuge zones for endemic species.

What are you most concerned about?

While fire in Mediterranean ecosystems is fundamental to ecological processes, an increase in forest fire frequency and severity is also harmful, because as natural fire regimes are modified, an area’s capacity for resilience is affected.

An increase in forest fires releases carbon dioxide (CO2) from forest soils and biomass, putting at risk the ecosystem services that the Sierra provides to communities.

Another important factor is the capacity to respond directly and indirectly to fires. In many places, the trained and equipped personnel available is less than the effort needed and the amount of ground that the response effort must cover.

What are the gaps in understanding that need more research?

Currently, there exist Integrated Fire Management and Climate Change Adaptation Programs for the 1857 and Sierra de San Pedro Mártir National Parks complex (1, 2), where the importance of fire in Mediterranean ecosystems and projections of climate change impacts are described, as well as direct and indirect actions to lessen risks and vulnerabilities.

It is important to channel efforts to understand the effects of fires on soils (specifically, their quality and carbon storage capacity), the spatiotemporal viability of prescribed burns in the region, the effects on hydrological balance, and on the distribution of species of flora and fauna in the region.

Lastly, it is important to boost the preparedness of front-line-response and wildfire-fighting personnel, in addition to spreading information and awareness for the community about the importance of the Sierra and about fire ecology in the region.

What is your plan moving forward to start to better understand or minimize the impacts from climate change?

Previously, various climate change adaptation measures were implemented within the San Pedro Mártir National Park and its area of influence, with the goal of contributing to the conservation and protection of forest floors, ecosystem restoration, long-term capture of carbon dioxide in forest biomass (planned reforestation), and management of a healthy fire regime.

For the management of a healthy fire regime, the focus was on the reduction of accumulated combustibles through the pruning of dead trees and cutting of trunks that represent a propagation and combustion risk during a fire. Another focus was the rehabilitation of firebreak gaps.

In this respect, we seek to extend the implementation of climate change adaptation measures, and to continue working on forest floor conservation alongside the cattle-raising community in improving and managing their production activities. We also seek to carry out awareness-raising actions with the community about the effects of climate change in our region and the ecosystem services that will be affected.

References 1. CONANP. (2020). Resumen Ejecutivo del Programa de Adaptación al Cambio Climático del Complejo de los Parques

Nacionales Sierra de San Pedro Mártir y Constitución de 1857. PNUD México-CONANP. https://www.conanp.

gob.mx/cambioclimatico/PACC-Constitucion-SSPM.pdf 2. CONANP. (2018). Programa de Manejo Integral del Fuego de la Región Mediterránea

en las Áreas Naturales Protegidas: Parque Nacional Constitución de 1857 y Parque

Nacional Sierra de San Pedro Mártir, Baja California, México (p. 297).

PNUD México-CONANP. 3. CONANP. (2016). Impacto del Clima Presente y Futuro en la Distribución Potencial

y Crecimiento Radial en Cuatro Especies de Coníferas en los Parques Sierra de San

Pedro Mártir y Constitución 1857 (Programa de Adaptación al Cambio Climático

Complejo de Los Parques Nacionales Sierra de San Pedro Mártir y

Constitución de 1857.). PNUD México-CONANP.

www.climatesciencealliance.org/2021-baja-report